# operator==,!=,<,<=,>,>=,<=>(std::chrono::time_point)

From cppreference.com
< cpp‎ | chrono‎ | time point

Defined in header `<chrono>` |  |
| (1) |
template< class Clock, class Dur1, class Dur2 > bool operator==( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++11) (until C++14)
template< class Clock, class Dur1, class Dur2 > constexpr bool operator==( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++14)
| (2) |
template< class Clock, class Dur1, class Dur2 > bool operator!=( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++11) (until C++14)
template< class Clock, class Dur1, class Dur2 > constexpr bool operator!=( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++14) (until C++20)
| (3) |
template< class Clock, class Dur1, class Dur2 > bool operator<( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++11) (until C++14)
template< class Clock, class Dur1, class Dur2 > constexpr bool operator<( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++14)
| (4) |
template< class Clock, class Dur1, class Dur2 > bool operator<=( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++11) (until C++14)
template< class Clock, class Dur1, class Dur2 > constexpr bool operator<=( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++14)
| (5) |
template< class Clock, class Dur1, class Dur2 > bool operator>( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++11) (until C++14)
template< class Clock, class Dur1, class Dur2 > constexpr bool operator>( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++14)
| (6) |
template< class Clock, class Dur1, class Dur2 > bool operator>=( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++11) (until C++14)
template< class Clock, class Dur1, class Dur2 > constexpr bool operator>=( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); |  | (since C++14)
template< class Clock, class Dur1, std::three_way_comparable_with<Dur1> Dur2 > constexpr auto operator<=>( const std::chrono::time_point<Clock,Dur1>& lhs, const std::chrono::time_point<Clock,Dur2>& rhs ); | (7) | (since C++20)

Compares two time points. The comparison is done by comparing the results time_since_epoch() for the time points.

1,2) Checks if the time points lhs and rhs refer to the same time point for the given clock.
3-6) Compares the time points lhs and rhs.
7) Compares the time points lhs and rhs. The return type is deduced from lhs.time_since_epoch() <=> rhs.time_since_epoch(), and hence the three-way comparison result type of `Dur1` and `Dur2`.

The `!=` operator is synthesized from `operator==`. | (since C++20)

### Parameters

lhs, rhs | - | time points to compare

### Return value

1) true if the lhs and rhs refer to the same time point, false otherwise.
2) true if the lhs and rhs refer to different time points, false otherwise.
3) true if the lhs refers to time point before rhs, false otherwise.
4) true if the lhs refers to time point before rhs, or to the same time point as rhs, false otherwise.
5) true if the lhs refers to time point after rhs, false otherwise.
6) true if the lhs refers to time point after rhs, or to the same time point as rhs, false otherwise.
7) lhs.time_since_epoch() <=> rhs.time_since_epoch().

### Exceptions

May throw implementation-defined exceptions.

### Notes

Two-way comparison operators of `time_point` were not constexpr in C++11, this was corrected in C++14.

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